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प्रश्न
Write a few slogans of your own on the topic “Save Water”
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उत्तर
- “To a thirsty man, a drop of water is worth more than a sack of gold”.
- “Water covers 2/3 of the surface of the earth. But only 0.002% is drinkable. Save water”
- “Save water to secure your future”
- “Don’t make nature cry, keep your water clean”
- “Store water for dry days”.
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संबंधित प्रश्न
Name the gas produced when chlorine is dissolved in water and exposed to sunlight.
Explain how the peculiar variation of density of water with temperature can cause water— pipes to burst in very cold places.
Answer the following question:
What is the chemical composition of water ? Give its molecular formula.
Explain rain water harvesting.
Of the total water available on the earth, fresh water forms ______ percent.
Fill in the blank:
The type of water softened by addition of washing soda is ______.
Match the terms in List I with the correct answers in List II.
| List I | List II |
| 1. Solubility in a given solvent decreases with an increase in temperature. | A: Na2SO4.10H2O |
| 2. A white efflorescent crystal | B: NaOH |
| 3. A hygroscopic dehydrating agent | C: Ca(HCO3)2 |
| 4. A deliquescent alkali | D: conc. H2SO4 |
| 5. A substance present in temporary hard water | E: CaSO4 |
In the coastal areas, wind current moves from the sea towards the land during the day; but during the night it moves from land to the sea. Discuss the reason.
Water polluted by various human activities causes a number of water borne diseases. Which of the following is not a water borne disease?
What is saltwater?
